The conbined thermal insulation part composed of ceramic tile and phase change composites (PCC) was prepared by ceramic tile, LiCl PCC, LiNO3 PCC, and pentaerythritol PCC. The thermal perotecting performance of the conbined thermal insulation part and its reference sample were characterized in a single-sided heating test equipment at 1200 ℃. The results showed that the back temperature of the conbined thermal insulation part is 222.3 ℃ at the heating time of 7650 s, while the back temperature of the reference sample is 644.0 ℃, which indicates that the conbined thermal insulation part has better thermal insulation performance. The temperature control time for the conbined thermal insulation part is 6780 s at the back temperature of 199.5℃, while that of the reference sample is 3135 s at the back temperature of 199.7℃, which indicates the conbined thermal insulation part has much longer temperature control time at the close back temperature. All the above results suggest that the conbined thermal insulation part has better thermal insulation performance, is a novel thermal protecting structure, and will have broad application perspect in the fields of aerospace and civilan thermal protection.